Tweetie has been pretty much universally recognized as the best iPhone Twitter client since it launched, and Tweetie 2.0 took it to the next level. In fact, it was so good, that Twitter decided to buy the app outright, rather than building their own iPhone app. News soon came that Tweetie would become “Twitter for iPhone” and would be made free (Tweetie sold for $2.99) to anyone who wanted it. Well, today is that day, as Tweetie 3.0 has been released with new features (we’ve got a list of them after the break) and is now simply known as Twitter. It’s full-featured, it’s the official Twitter app for the iPhone, and therefore it will have access to more Twitter resources than any other Twitter app out there. We recommend it highly, and you can download it now.

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We can’t say enough about the love we have for what the folks over at Square are doing. In a nutshell, they are bringing credit card processing to the masses by way of connected smartphones (like iPhone and Android devices) and iPads as well. You download the free app and sign up, and they send you a free credit card reader that hooks into the audio jack on your device. From there, whether you are a big business, small coffee shop, a seller at the flea market, or just wanna collect half the check from your friend after dining out, you can can accept a credit card payment right on your phone. The video above explains it way better than we can, but the news here is that Square is now available for iPhone and iPad, as well as Android.

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Surprise, surprise - looks like iPhone and iPod touch users the world over are downloading the recently-approved Opera Mini app, a free Safari web browser alternative. In fact, it’s so popular, that it’s the number one free download in all 22 App Store regions. Have you tried it?

One of the more exciting iPad apps that shows off what may be the future of literature and reading is the Marvel Comics app. Setting aside the whole problem where you can’t share the comics, and can’t sell or give away the old comics you’ve purchased and build community around it, we must say, it looks pretty slick. If you are a fan of Marvel, this will obviously be an app you’ll want to add to your iPad. The app is essentially a no-cost storefront that let’s you preview and purchase comics to read.

For anyone concerned about a lack of killer apps on the iPad that would differentiate it from the iPhone or oPod touch, we bring you news that the Netflix iPad app is now available for download for free from the App Store, and it includes Instant Streaming. That’s right, if you’ve got your iPad connected to a Wi-Fi network, you can use it to watch the entire catalogue of Netflix Watch Instantly movies and TV shows, right on your iPad. In addition, you can add movies to your queue, rearrange things, and everything else you’d expect to do with your Netflix membership.

Of course, none of this will work unless you are a Netflix member, but if you are, you can start enjoying the 20,000+ titles available on the service right from your iPad on Saturday. Oh, and for the record, the app currently works only on the iPad - there is no Netflix app available yet for the iPhone or iPod touch.

Just like the Barnes & Noble iPad app that we talked about previously, an Amazon Kindle app that is specifically made and formatted for the iPad is also on the way. The folks over at the New York Times were able to get a look at it, and it sounds fairly similar to what we saw from Apple with their iBooks app. You can control the speed of a page turn with your finger, and it has a couple of new ways for people to view their entire eBook library. One of those, above, shows books covers with a background of someone reading a book under a tree. The position of the sun in the background changes depending on the time of day, which is fairly cool.

We find the whole things with both B&N and Amazon rushing to get their eBook reader apps ready for the iPad to be very interesting. In a nutshell, the iPad is now the only mobile device that will let you read eBooks purchased from Apple, Amazon, or Barnes & Noble. All the other devices are tied to one store. Between the eBook stores, and apps like Instapaper, the iPad is prepped to be the most feature-rich eBook reader on the planet, and that doesn’t even take any of its other features into account.

Looks like Apple isn’t the only company looking to capitalize on the iPad hype in order to sell eBooks. Barnes & Noble has just made it public knowledge that they plan on releasing an iPad-optimized version of the B&N reader app, with the goal being to have it ready in the App Store on day one. We must say, we like it. In fact, this may cement the iPad as the best reader device around, because you’ve got the B&N app, the Kindle app, and of course, the Apple iBooks app as well (among others.) This means that you can purchase a book in any of those three ebook marketplaces, and read them all on your iPad. That’s something you just can’t do with a Kindle or nook. Let’s just hope that Apple doesn’t give these apps the same treatment that they’ve given to others, like Google Voice.

Aura Cacia is a nationally branded Aromatherapy product provider and today has leaped dredlocked and pachouli-soaked head-first into the smartphone world with their new iPhone app. Now you can learn about the history and benefits of aromatherapy without having to worry about getting sandalwood oil all over your iPhone touch-screen. While the app does have different factoids and bits of information regarding aromatherapy treatments and different combinations of oils, it is merely an information source and not a diagnostic tool like many other similar iPhone apps in the same arena. Considering it is free, I guess you get what you pay for.

So check it, Shoot It!, one of our absolute favorite apps in the entire iTunes App Store catalogue has finally gone free. As a refresher, shoot it! allows you to take a snapshot and have it sent as a physical postcard to anyone in North America, Europe, and some parts of Asia. It is all kinds of awesome, and we even used it in our Modern Warfare 2 Xbox 360 console giveaway. Fun times. We highly recommend grabbing it and putting it to good use!